!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="index_style.css">
    <title>全屏背景</title>
</head>
<body>
    <div id="div_login">
        <div id="div_title"><h1>用户登录</h1></div>
        <div id="midden">
            <p><input class="inputinfo" type="text" name="UserName" placeholder="请输入用户名"></p>
            <p><input class="inputinfo" type="password" name="PassWord" placeholder="请输入密码"></p>
            <input type="submit" class="submitbutton" value="登录">

            <div id="info">
                <h3>注意事项</h3>
                <P>1.</P>
                <p>2.</p>
                <p>3.</p>
                <P>4.</P>
            </div>
        </div>
    </div>
</body>
</html>